:root{--paper:#f4f8f7;--surface:#fff;--ink:#243a35;--muted:#5d716b;--line:#d3e1dc;--accent:#17685c;--soft:#e8f2ee;--green:#14786a;--red:#a62d43;--serif:Georgia,Cambria,serif;--sans:'Microsoft JhengHei','Hiragino Kaku Gothic ProN',system-ui,sans-serif}
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var(--line)}.en{font-family:var(--serif);font-size:1.6rem;line-height:1.8;overflow-wrap:anywhere}.reading{display:block;font-size:.9rem;color:var(--muted);margin-top:4px}.translation{font-size:1rem;margin:10px 0 0}.phrase-head{display:flex;justify-content:space-between;align-items:start;gap:16px}.audio-button{border:1px solid var(--line);background:var(--surface);border-radius:50%;height:42px;width:42px;color:var(--accent);flex-shrink:0;font-size:1.1rem}.audio-button:hover{background:var(--soft)}.phrase-note{font-size:.85rem;color:var(--muted);margin:10px 0 0}.dialogue{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:24px;margin:28px 0}.dialogue-line{display:grid;grid-template-columns:25px 1fr auto;gap:12px;margin:18px 0}.speaker{font-size:.85rem;color:var(--muted);padding-top:8px}.dialogue .en{font-size:1.2rem}.dialogue .translation{font-size:.85rem;color:var(--muted)}.choice-list{display:grid;gap:8px;margin:16px 0}.choice{padding:12px 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0;color:var(--muted)}.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--ink);color:white;border-radius:8px;padding:12px 20px;max-width:min(90vw,600px);z-index:40;font-size:.9rem}.storage-warning{position:sticky;bottom:0;background:#fff2d9;color:#694b14;border-top:1px solid #dbba78;padding:12px 24px;font-size:.85rem;z-index:30}.loading{padding:60px 0;color:var(--muted)}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}[hidden]{display:none!important}.danger{color:var(--red)}.divider{border:0;border-top:1px solid var(--line);margin:30px 0}.empty{padding:24px;border:1px dashed var(--line);border-radius:8px;color:var(--muted)}
@media(max-width:900px){.workspace{grid-template-columns:170px minmax(0,1fr)}.sidebar{padding-left:16px}.site-header{padding:20px 24px}main{padding:30px 24px}.hero{grid-template-columns:1fr 110px}.hero-kana{font-size:6rem}.sidebar nav a{padding:12px 8px;font-size:.85rem}.two-columns{grid-template-columns:1fr}.sidebar-note{margin-top:40px}}
@media(max-width:640px){.site-header{padding:16px 20px}.brand-mark{width:40px;height:44px;font-size:1.8rem}.brand{font-size:1rem}.brand small{font-size:.65rem}.back-site{font-size:.75rem}.workspace{display:block}.sidebar{padding:0;position:sticky;top:0;z-index:15;background:var(--paper);border-bottom:1px solid var(--line)}.sidebar nav{display:flex;overflow-x:auto;padding:8px 12px;gap:2px}.sidebar nav a{display:block;white-space:nowrap;font-size:.78rem;padding:8px 10px}.sidebar nav a span{display:none}.sidebar-note{display:none}main{padding:24px 20px 64px}.hero{gap:12px;grid-template-columns:1fr 75px}.hero-kana{font-size:4.5rem}.hero-kana small{font-size:.65rem}.daily-plan{padding:22px 20px}.plan-heading{align-items:start}.plan-stats{gap:24px}.plan-stats strong{font-size:1.6rem}.form-grid{grid-template-columns:1fr;gap:18px}.lesson-row{grid-template-columns:32px 1fr;gap:10px}.lesson-row a{grid-column:2;justify-self:start}.kana-grid{gap:7px}.kana-tile span{font-size:2rem}.kana-tile{padding:12px 3px}.review-card{padding:28px 20px;min-height:330px}.rating-grid{grid-template-columns:1fr 1fr}.progress-grid{gap:8px}.progress-grid div{padding:12px 8px}.progress-grid strong{font-size:1.35rem}.progress-grid span{font-size:.68rem}.dialogue{padding:20px 16px}.dialogue-line{gap:8px;grid-template-columns:16px 1fr auto}.audio-button{height:36px;width:36px}.history-row{grid-template-columns:75px 1fr 35px}.actions .primary,.actions .secondary{padding:11px 14px}}
main:focus{outline:none}
/* Motion answers an action: pressed controls, revealed answers and route changes. */
button,.primary,.secondary,.quiet,.sidebar nav a{min-height:44px;-webkit-tap-highlight-color:transparent;transition:background-color .14s ease,border-color .14s ease,color .14s ease,box-shadow .14s ease,transform .1s ease}
button:not(:disabled):active,.primary:active,.secondary:active{transform:scale(.98)}
button:disabled{opacity:.65}
.primary{box-shadow:0 2px 0 #33449f;min-height:46px}
.primary:active{box-shadow:none}
.quiet:hover,.sidebar nav a:hover{background:var(--soft)}
.audio-button{width:44px;height:44px;min-height:44px}
.is-playing{background:var(--accent)!important;color:white!important;border-color:var(--accent)!important}
.choice{min-height:52px;line-height:1.65}
.choice:hover:not(:disabled){background:var(--soft);border-color:var(--accent)}
.choice.correct:disabled{opacity:1}
.choice.correct:hover{background:#e5f3ee}
.answer-reveal{animation:answer-in .16s ease-out}
.page-change{animation:page-in .14s ease-out}
@keyframes answer-in{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:none}}
@keyframes page-in{from{opacity:.5}to{opacity:1}}
.sidebar{align-self:start;position:sticky;top:0}
.sidebar nav{gap:3px}
.sidebar-note{margin-top:32px}
.learning-ribbon{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:18px 0 22px;border-top:1px solid var(--line);margin-bottom:16px}
.learning-ribbon small,.learning-ribbon strong,.learning-ribbon span{display:block}
.learning-ribbon strong{font-size:1.1rem;margin:4px 0}
.learning-ribbon span{color:var(--muted);font-size:.85rem}
.course-overview{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:24px;background:var(--soft);border-left:4px solid var(--accent);margin-bottom:16px}
.course-overview>div{flex:1}.course-overview p{margin:6px 0 14px;font-size:.9rem;color:var(--muted)}
.course-meter{height:7px;max-width:480px;overflow:hidden;background:var(--line);border-radius:4px}.course-meter span{display:block;background:var(--accent);height:100%}
.course-prelude{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:.9rem;margin-bottom:30px}
.course-stage{margin:32px 0 44px}
.course-stage header{display:flex;align-items:center;gap:16px;padding-bottom:16px;border-bottom:2px solid var(--ink)}
.course-stage header>div{flex:1}.course-stage header h2{margin:0 0 4px}.course-stage header p{font-size:.85rem;color:var(--muted);margin:0}
.stage-number{width:34px;height:34px;display:grid;place-items:center;border-radius:50%;background:var(--ink);color:white;font-family:var(--serif);flex-shrink:0}
.lesson-row h3{margin:0 0 5px;font-size:1.05rem}.lesson-row.is-complete .lesson-number{color:var(--green)}
.lesson-steps{display:flex;gap:6px;overflow-x:auto;position:sticky;top:0;background:var(--paper);padding:10px 0;z-index:10;border-bottom:1px solid var(--line)}
.lesson-steps button{white-space:nowrap;border:0;background:var(--soft);color:var(--accent);padding:8px 14px;border-radius:6px;font-size:.8rem}
#lesson-phrases,#lesson-builder,#lesson-dialogue,#lesson-task{scroll-margin-top:80px}
.phrase-index{font-size:.75rem;display:block;margin-bottom:5px}
.lesson-next{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:24px;margin-top:32px}
.sentence-builder,.foundation-check{margin:28px 0;border:1px solid var(--line);border-radius:10px;padding:24px;background:var(--surface)}
.sentence-slots{display:flex;align-items:center;flex-wrap:wrap;gap:8px;min-height:76px;border-bottom:2px solid var(--accent);padding:12px;margin:22px 0;background:var(--paper)}
.sentence-slots .muted{font: .85rem var(--sans)}
.word-bank{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 24px}
.word-bank button,.sentence-slots button{padding:8px 14px;border:1px solid var(--line);border-radius:6px;font-family:var(--serif);font-size:1.15rem;background:var(--surface);color:var(--ink)}
.sentence-slots button{background:var(--soft);border-color:#a1ace6}.word-bank button:disabled{opacity:.3}.word-bank button:hover:not(:disabled){border-color:var(--accent);background:var(--soft)}
.foundation-list{list-style:none;padding:0;margin:24px 0}.foundation-list li{display:grid;grid-template-columns:30px 1fr auto;align-items:center;gap:18px;border-bottom:1px solid var(--line);padding:24px 0}
.foundation-list h2{font-size:1.1rem;margin:0 0 6px}.foundation-list p{font-size:.85rem;color:var(--muted);margin:0}
.foundation-explanation{font-size:1.05rem;line-height:1.9}
.sound-examples article{padding:22px 0;border-bottom:1px solid var(--line)}.sound-examples p{font-size:.9rem;color:var(--muted);margin:5px 0}
.beat-strip{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}.beat-strip>span{display:grid;place-items:center;min-width:52px;padding:12px 10px 8px;border-bottom:3px solid var(--accent);background:var(--soft);border-radius:6px 6px 0 0}.beat-strip strong{font-family:var(--serif);font-size:1.4rem;font-weight:400}.beat-strip small{font-size:.7rem}
.scenario-list{display:grid;grid-template-columns:1fr 1fr;gap:28px}.scenario-list article{padding:24px 0;border-top:2px solid var(--ink)}.scenario-list h2{margin:16px 0 10px}.scenario-list p{font-size:.9rem;color:var(--muted)}.scenario-list .actions{margin-top:24px}
.conversation-turn{padding:24px;background:var(--soft);border-radius:3px 16px 16px 16px;margin:24px 0}.conversation-turn .en{margin:6px 0}.translation-toggle{margin:8px 0;padding:0;border:0;font-size:.85rem}.translation-toggle summary{font-weight:400;color:var(--muted)}.translation-toggle p{margin-top:8px}
.scenario-response{padding-left:24px;border-left:3px solid var(--line)}.scenario-response .choice{font-family:var(--serif);font-size:1.1rem}
.conversation-recap{text-align:left;max-width:620px;margin:30px auto}.conversation-recap>div{padding:18px 0;border-bottom:1px solid var(--line)}.conversation-recap p{font-family:var(--serif);font-size:1.15rem;margin:5px 0 12px}.conversation-recap small{color:var(--muted);font-size:.75rem}
.session-progress span{transition:width .18s ease}.session-top{gap:12px}.session-top button{padding:8px;text-decoration:none;border:1px solid var(--line);border-radius:6px;white-space:nowrap}.review-card{scroll-margin-top:20px}.rating-grid{position:sticky;bottom:8px;z-index:8;padding:8px;background:var(--paper);border-radius:10px}.rating-button{min-height:70px}
.activity-summary{display:flex;gap:20px;flex-wrap:wrap;margin:20px 0;color:var(--muted);font-size:.9rem}.activity-summary strong{color:var(--ink)}
@media(max-width:640px){.sidebar{top:0}.sidebar nav{scrollbar-width:none}.sidebar nav::-webkit-scrollbar{display:none}.sidebar nav a{min-height:44px;font-size:.8rem}.learning-ribbon{align-items:start;gap:12px}.learning-ribbon .secondary{padding:10px 12px;white-space:nowrap;font-size:.8rem}.course-overview{display:block;padding:20px}.course-overview .primary{margin-top:18px}.course-prelude{display:block}.course-prelude .quiet{padding-left:0}.lesson-row a{min-height:44px}.course-stage header{gap:10px}.course-stage header h2{font-size:1.1rem}.lesson-steps{top:61px;margin:0 -20px;padding:8px 20px}#lesson-phrases,#lesson-builder,#lesson-dialogue,#lesson-task{scroll-margin-top:130px}.sentence-builder,.foundation-check{padding:20px 16px}.foundation-list li{grid-template-columns:24px 1fr;gap:12px}.foundation-list a{grid-column:2;justify-self:start}.scenario-list{grid-template-columns:1fr;gap:12px}.conversation-turn{padding:20px 16px}.scenario-response{padding-left:16px}.rating-grid{bottom:0;margin:12px -8px;gap:8px}.rating-button{padding:10px 6px}.session-top{font-size:.78rem}.session-top button{font-size:.75rem}.review-card{min-height:300px}.lesson-next .primary,.lesson-next .secondary{width:100%}.toast{bottom:16px}.beat-strip{gap:6px}.beat-strip>span{min-width:44px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
/* A reading lesson uses a continuous column; numbered marks follow real steps. */
.guide-reading,.guide-method,.lesson-preparation,.guide-checks,.guide-examples{max-width:720px}
.guide-reading p,.guide-method p,.lesson-preparation p{font-size:1rem;line-height:1.95;max-width:65ch}
.guide-reading>section{margin:36px 0;border-top:1px solid var(--line);padding-top:24px}
.guide-reading h2{display:flex;align-items:baseline;gap:14px;font-size:1.2rem}
.reading-step{font-family:var(--serif);color:var(--accent);font-size:1.4rem;flex-shrink:0}
.unit-position{font-size:.85rem;color:var(--muted);margin:0 0 10px}
.guide-method{padding:20px 0;margin-bottom:28px}
.learning-contract{padding:20px 24px;background:var(--soft);border-left:3px solid var(--accent)}
.learning-contract ol{padding-left:24px;margin:12px 0 0;font-size:.9rem;line-height:1.85}
.guide-examples>article{padding:24px 0;border-bottom:1px solid var(--line)}
.guide-examples .en{margin:0}.guide-examples h2,.guide-checks h2{margin-top:36px}
.guide-question{padding:20px 0;margin:22px 0;border:0;border-top:1px solid var(--line);min-width:0}
.guide-question legend{font-weight:600;line-height:1.8;padding-right:12px;max-width:100%}
.lesson-wordlist{margin:20px 0;border-top:1px solid var(--line)}
.lesson-wordlist>div{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.5fr);gap:16px;padding:12px 0;border-bottom:1px solid var(--line)}
.lesson-wordlist dt{font-family:var(--serif);font-size:1.1rem;overflow-wrap:anywhere}
.lesson-wordlist dd{margin:0;color:var(--muted);font-size:.9rem}
.locked-label{font-size:.8rem;color:var(--muted);padding:10px 14px;white-space:nowrap}
.is-locked .lesson-number{opacity:.65}
@media(max-width:640px){.learning-ribbon{display:block}.learning-ribbon>.primary{margin-top:16px}.guide-reading h2{font-size:1.1rem}.learning-contract{padding:18px}.locked-label{grid-column:2;justify-self:start;padding-left:0}.lesson-wordlist>div{grid-template-columns:1fr;gap:4px}.guide-reading p,.lesson-preparation p{font-size:.95rem}.guide-question{padding-top:16px}}

.hero-kana{font-size:6.5rem}.en{font-family:Georgia,Cambria,serif;letter-spacing:0;line-height:1.55}.dialogue-line{grid-template-columns:55px minmax(0,1fr) auto}.dialogue .en{font-size:1.2rem;margin:0}.review-card{max-width:720px;background:var(--surface);border:1px solid var(--line);padding:28px;border-radius:12px}.review-card .field{margin:22px 0}.review-card h1{font-size:1.6rem}.builder-answer{min-height:64px;padding:16px;background:var(--soft);border-bottom:2px solid var(--accent);font-size:1.15rem;overflow-wrap:anywhere}.word-bank{display:flex;flex-wrap:wrap;gap:10px;margin:20px 0}.word-unit{margin-top:32px}input[type=search]{border:1px solid var(--line);padding:12px;border-radius:7px;background:var(--surface);color:var(--ink);width:100%}.brand-mark{font-size:2rem}.dialogue-translation{max-width:100%}@media(max-width:600px){.dialogue-line{grid-template-columns:40px minmax(0,1fr) auto;gap:8px}.review-card{padding:20px}.hero-kana{font-size:4.8rem}.en{font-size:1.35rem}}